The risks of tetralogy of Fallot are mainly cardiac insufficiency, dyspnea and hypoxic episodes, which can be life-threatening in severe cases. The risks of tetralogy of Fallot are mainly cardiac insufficiency, dyspnea and hypoxic episodes, etc. Severe hypoxia can cause syncope. The prognosis of those who are not treated surgically in childhood is poor, and most of them die before adulthood due to complications such as cardiac insufficiency, infective endocarditis and cerebrovascular disease. Tetralogy of Fallot is more common in children with cardiac anomalies. Clinical symptoms include progressive cyanosis, dyspnea, fatigue after activity and resting in a squatting position after exertion. Surgery is the main treatment. The majority of children who undergo surgery have a good prognosis and are able to live and exercise normally.